So I've been going through all the posts on this topic because I have a silkie hen that has a sour crop. I've read about giving ac vinegar, yogurt, not giving them feed, no fruits, but then I find other threads that say yogurt and ac vinegar makes things worse. I just gave her some kefir tonight in hopes of making something work. I tried giving her some olive oil and yogurt earlier, but that was a no go. Tonight I just gave her a very small syringe of it because I was afraid of giving too much. I massaged her crop earlier today and a bunch of liquid came out with a bit of feed. I'm at a total loss here and I feel like I'm running out of time. She's so thin. She's fiesty but I'm sure her body can only take so much. I'd really appreciate some input on the rights and wrongs of dealing with this situation. Thanks so much.